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Cookies
PHP can send a cookie for it to be stored on the user’s computer using the function: setcookie ($s1,$s2 [,$i[,$s3[,$s4[,$b1=false[,$b2=false]]]]]);This function must precede any output, including the <html> tag as well as any whitespace.
$s1 is the name of the cookie. $s2 is the value. i is the expiration time in seconds. The default is 0, which means that the cookie expires when the browser closes. $s3 is the path which will have access to the cookie. $s4 is the domain which will have access to the cookie. If $b1 is true, the cookie will be sent only over a secure HTTPS connection, if one exists. If $b2 is true, the cookie will be accessible only through HTTP, which means that JavaScript won’t be able to access it.
As the user refreshes the page, the browser prints "abc123".
RESETRUNFULL
Every time a page is requested from the server, all associated cookies are sent along from the local computer. All cookies, including those saved by JavaScript, can be accessed using the array $_COOKIE. To delete a cookie, set the expiration time to an expired time.RESETRUNFULL
<?php
$t=time()+60*60; // expires in 1 hour
setcookie("test","abc",$t,"/"); // / for the current domain
setcookie("arr[a]","123",$t,"/"); // storing into an array
?>
<!DOCTYPE html>
<html>
<head></head>
<body><?php
if (isset($_COOKIE["test"])) echo $_COOKIE["test"]; //abc
if (isset($_COOKIE["arr"]["a"])) echo $_COOKIE["arr"]["a"]; //123
?>
</body>
</html>The array $_REQUEST stores the combined key-value pairs of $_GET, $_POST and $_COOKIE. These superglobals are already decoded. Using urldecode()
on them could have unexpected and dangerous results.